ds cDNA synthesis kit

May I know if any of the forumers used kits to synthesize ds cDNA before. If yes, which kits or what type of kits that you are using? I am trying to look for one, that can synthesize around 4-5kb length fRNA. Had one 1st strand cDNA synthesis kit, but it's not suitable for me because I need a ds cDNA to do RE digestion and cloning.

Needed advice and suggestion/opinion regarding to kits or methods or protocol.